"It's like a dream's dream," Perry told USA Today of the possible nomination. "When I was growing up and working on music, it was always a dream to win a Grammy, but Oscar was so far out of my dream sphere."

She added: "This would be a nomination of a completely different calibre. One that is more impressive than many other ones I've had.

"It's interesting to step out of your playing field and to be recognized from a different angle. It would be an honor."

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Katy Perry: Part of Me 3D pictures: Katy performs with a purple furry friend.
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